title: Cd(II) biosorption using Lessonia kelps.
abstract: Lessonia kelps (L. trabeculata and L. nigrescens) have been successfully used for the recovery of Cd(II) from near neutral solutions. The biomass was pre-treated with calcium chloride for stabilization of alginate-based compounds. SEM-EDAX analysis and FT-IR spectrometry analysis were used for identifying the modifications of the biomass. Sorption isotherms were performed at the optimum pH (i.e., pH 6) and the maximum sorption capacity reached up to 1 and 1.5 mmol Cd g(-1) for L. nigrescens (L.n.) and L. trabeculata (L.t.), respectively. The Langmuir equation fits well experimental data. The temperature (in the range 20-40 °C) had a more marked effect on affinity coefficient than on maximum sorption capacity. The influence of particle size, sorbent dosage, metal concentration and temperature was evaluated on uptake kinetics. The kinetic profiles that were modeled using the Crank equation (i.e., the resistance to intraparticle diffusion) were hardly affected by the temperature and the particle size contrary to the sorbent dosage and the metal concentration, which show greater impact. The pseudo-second order rate equation was also tested for the modeling of uptake kinetics.
authors.affiliation: Ecole des Mines d'Alès, Laboratoire Génie de l'Environnement Industriel, Equipe BPCI, 6 avenue de Clavières, F-30319 ALES cedex, France.
authors.forename: Carmen
authors.initials: C
authors.lastname: Boschi
authors.forename: Holger
authors.initials: H
authors.lastname: Maldonado
authors.forename: Martha
authors.initials: M
authors.lastname: Ly
authors.forename: Eric
authors.initials: E
authors.lastname: Guibal
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000737:chemistry*; D004305:Dose-Response Relationship, Drug; D006863:Hydrogen-Ion Concentration; D044423:Kelp / Q000737:chemistry*; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D008958:Models, Molecular; D010316:Particle Size; D000459:Phaeophyceae; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D002104:Cadmium